Air-valve for carbureters.



G. M. SCHEBLER.

AIR VALVE FOR CARBURETERS.

APPLIUATION FILED JUNE 27,1912.

Patented Aug. 25, 1914 UNITED STATES PATENT OFFICE.

GEORGE M. SCHEBLER, 0F INDIANAPOLIS, INDIANA, ASSIGNOR T0 FRANK H. WHEELER, OF INDIANAPOLIS, INDIANA.

AIR-VALVE FOR CARBURETERS.

Specification of Letters Patent.

Patented Aug. 25, 1914.

Original application filed February 5, 1912, Serial No. 675,429. Divided and this application filed June 27, 1912. SerialNo. 706,182. i

To all whom l'15 may conferir.'

3e it known that I, (lconon M. dummen, a citizen of the United States, residing at Indianapolis. in the county of Marion and State of Indiana.. have invented a new and -useful Air-Valve for Carburettrs, of which the following is a specification.

The object of any invention is 2 @deduce improvements in details of constr/uetion of an air inlet val ve of :i earbureter.

This case a division of my eo-pending application Serial No. o'..-,l;9, tiled February 5, 1912. l

The accompanying invention.

The single figure of the drawingr is a Cen tral vertical section through a carburetor embodyinu my invention.

In the drawing, Ulf indicates a bowl-like fuel rhauzoer of substantittlly connnon form. At its bottom, this chamber is perforated at 13, and through this perforation is projected the lower end etna hollow stein 1l which is carried l j" the lower end of a main body 15 witlzin which a mirinor chamber or passage C is formed. The lower end of stem 1li is closed by :i renmvable threaded plug 20, to permit. drainage of the settling chamber or sump thus: `formed in such lower end. Surrounding: the lower end of stem 14 is a. primary air inlet structure l5), which is freely connected by passages 2li with the interior 22 of the stein 14. A fuel nozzle 26 is mounted within the stem 1liabove the chamber Q1, and is Supplied with fuel from the chamber 10 througll diagonal fuel passfiges 3Q The passage within the stern 14 coinmunieates at its upper end with the mixing Chamber 16, and 'the nozzle Qt) lies` axially within this pasl ne and is provided nf" its upper end with lateral passages 2S. The supply of fuel through these passages is controllegl by a needle valve 31, which is guided by the upper cud Q6 of the bore of the. nom/.le "26. The Vvalve stein 31 extends draining illustrates my upward freely through a protective tube, so

rocable block 45, which is mounted in the interior of' a boss 46 carried by the upper wall of the main body 15. A light spring 47 arts upon the block 4 5 to drive it downwardly.

Iivoted at 51 within chamber 16 is a'lever 52 carrying a yoke 53, which is pivoted to the lever on a pivot 54 at right angles to the pivot 51 and is provided at its ends With rollers or fingers 55 which project under and engage with the lower end of block 45. The opposite end of' lever 5:2 is provided with a roller or bearing piece 56 which takes under a nange- 57 carried by the stem 58 of the auxiliary air inlet valve 59. The stem 58 of valve 59 is Centrally bored at 61 to receive a guide pin (32 on which fits a Washer G3, between which and the lower end of stem .'36, is mounted a spring which normally' urges the valve 59 upwardly against its Seat (35. The tension of spring' 6l against the valve 59 may be readily adjusted by means of a temper screw 6G whirh carries and is p1'el'.-ralil vY integral with the guide pin A(S2 and is threaded through the lower wall of easing 15 so as to 'form an adjustable abutment for washer 63, This temper screw may be held in any desired position of adjustnient by the set screw 67.

In the commercial manufacture of carbureters for general use, I have found that much difficulty is experienced by individua-l users of carbureters where ordinary tests of such carbureters indicate that they are proporly designed to produce proper fuel miX- tures and such apparently erratic results have been a source of continual puzzle to the rolninereial manufacturers of carbureters. I have now found to be untenable the theory vhirh has heretofore commonly obtained that individual makes of engines do not materially affect, by reason of their cylinder proportions and speeds, the action of carburelers and I have found that, on the contrary` each partieular type of engine has ipparenty unexplainable idiosynrrasies of offert upon a eurbureter at various speeds. in order, therefore, to be able to produte a carburetor having in general a. fixed. forni as to its several parts so that it may be manul'acluied cheaply in large numbersI` and yet fso that it may be remlilj. adapted for differentl'ljvpes of engines, l hue so fmmtiuctCd my present carburcter that, while it nitty be standard as to most of its parts, I may readily supply the standard portion with an air inlet nozzle particularly designed empirically for the particular type of en 'ne to which the carbureter is to be attache For this purpose therefore, I have provided the upper wall of the casing l5 with a circular seat or socket -71 into which may be fitted any one of a number of air inlet nozzles 72.

Each of these nozzles is provided at its outer end with an inwardly rojecting annular valve seat 65 against W ich the valve 59 normally rests. From this seat 65 inwardly the nozzle 72 is flared, or increased in diameter, as shown at 73. The exact conformation of the flared portion 73 I determine empirically by attaching the carbureter to an engine of given type; running the same at different speeds and determining by experiment the space or air passage which should be had for the most eiiicient mixture when the valve 59 is by the suction of the engine at that particular speed, moved downwardly away from seat 65.

By providing the main casing with a seat for the reception of any desired air inlet fnozzle, it willjbe seenv that it is possible for me to produce a standard carbureter which may then be especially adapted for an-en- 50` gine of any particular manufacture or type by merely supplying the standard carbureter structure with the special air inlet nozzle which I find by experiment to be the best adapted to that particular type of engine.

In operation, screw 41 is so adjusted in block 45 that valve 31 will be adjusted relative to the nozzle 26 to a point where at the low speeds of the engine when sufficient air therefor can be drawn through the primary air inlet 19, there will be just suflicient gasolene supplied through passages 28 past the valve 31 to give proper quantities o fuel to the air passing inwardl throu h the inlet structure 19. In all positions o adjustment the block 45 rests upon rollers 55 of lever 52, As the speed of the engine is increased, valve 59 will be drawn downwardly against the action of spring 64 so as to admit an additional quantity of air which must be supplied with a sufficient quantity of fuel by producing a richer mixture of fuel with the air coming in through the primary inlet 19, and consequently, as the valve 59 is moved inwardly by the suction'of the engine, lever 52 is swung by the inward movement of the valve so as to raise the needle valve 31 and thus permit a greater quantity oY fuel to be delivered to the air passin upwardly from the primary inlet 19 throui the assage 22.

60 The screw 41 will be ordinarily adjusted for the particular engine to which the carbureter is a plied and for ordinary or average weat er conditions and this adjustment is not intendedv to be often changed.

66 In order to prevent sudden fluctuations of valve 59 I provide a dash pot retarder therefor comprising cylinder' 91 and piston 92 which lits the cylinder in such manner as to 'offer some slight resistance to movement in either direction. Piston 92 is provided with 70 a stem 98 which must fit the guiding bearing 94 tightly enough to prevent the passage of air to or from the cylinder. A rigid connection between stem 93 and valve 59 would require extreme accuracy of alinement of the cylinder and valve support and would thus make the cost of production commercially prohibitive. In order to avoid this diHiculty, therefore, I connect stem 93 to valve 59 'oy a free ball-and-socket joint 95 s0 and then counterbore stem 58 so that onl its lower end touches the guide pin 62. The length of contact between the guide pin 62 and that part of the bore in the stem 58 which is not counterbo'red' is sufficiently 35 short, and the joint between such parts is sutliciently loose, to permit slight disalinement.. Cylinder 91 is carried by a cage or support 96 which may be threaded or otherwise secured to the upper end of any air- 9p inlet nozzle 72 which may be attached to the carbureter body.

I claim as my invention:

1. In a carbureter, the combination with the main body having an air inlet 'provided 95 with an inwardly opening valve seat, an air valve arranged wit-hin said body and associated with said valve seat, a guide stem projected into an axial 4bore of the valve, said axial bore exceeding the diameter of the guide stem except for a sufficiently short distance at the entrance end of the bore to allow slight disalinement and the guide stem projecting past the smaller portion of the bore into the larger portion thereof, a spring arranged to act axially upon the valve to drive it to its. seat, a dash pot arranged in substantial alinement with the valve; a piston mounted in said dash pot, a stern carried by said piston, a bearing for said stem, and a iexible positive connection between Said piston and the valve.

2. In a carbureter, the combination with the main body having an air inlet provided with an inwardly opening valve seat, an air valve arranged within said body and associated ,with said valve seat, a guide stem projected into an axial bore of the valve and sufliciently loose therein to permit slight disalinement, a spring arranged to act axially upon the valve to drive it to its seat, a dash pot arranged in substantial alinement with the valve, a piston mounted in said dash pot, a stem carried by said piston, a. bearing for said steni,'and a flexible positive connection between said piston stern and the valve.

3. In a carbureter, the combination with the main body having an air inlet provided with an inwardly opening valve seat, an '130 air` valve arranged within said body and associated with said valve seat, a guide stein projected into an axial bore of the valve,

`said axial bore exceeding the diameter of the main body having an air inlet provided' with an inwardly opening valve seat, an air valve arranged within said body and associated with said valve seat, a guide stein projected into an axial bore ofthe valve, said axial bore exceeding the diameter of the guide stem except at the entrance end of the bore, a spring interposed between the valve and the guide stem to normally drive the valve to its seat, an adjusting screw mounted in the main body and forming an adjustable support for the guide stein, a dash pot, a stein carried by said piston, a bearing for said stem, and a flexible connection between said stem and valve.

5. Iii a carbureter, the combination with the main body having an air inlet provided with an inwardly opening valve seat, an air valve arranged within said body and asso ciated with said valve seat, a guide Stem projected into an axial bore of the valve,V

said axial bore exceeding the diameter of the guide stem except at the entrance end of the bore and the guide stem projecting past the smaller portion of the boreI into the larger portion thereof, a spring interposed between the valve and the guide stem to normally drive the valve to its seat, an adjustable screw mounted in the main body and forming an adjustable support for the guide stem, a second stem and bearing therefor, and a flexible connection between said sec- `ond stem and the air valve.

6. In a carbureter, the combination with the main body having an air inlet provided with'an inwardly opening valve seat, an air valve arranged withinsaid body and associated with said vvalve seat, a guide stem projected into an axial bore of the valve, a sprin interposed between the valve and thev gui e stein to normally drive the valve to its seat, an adjusting screw mounted in the main body and forming an adjustablesupport, for the guide stein, a 'dash pot, a

' stem carried by said piston, a bearing for said stein, and a flexible connection between said stein and valve.

7. In a carbureter, the combination with the main body having an air inlet provided with an inwardly opening valve seat, an air ,valve arranged within said-body and aS- sociated with said valve seat, a ide stein 'projecting into an axial bore of t e valve, a

spring interposed between the valve and the guide stem to normally drive the valve to its seat, ap adjusting screw mounted in the main body and forming an adjustable independent support for the guide stem, a SeC- ond stem and bearing thereforl located on the opposite side of said valve from said guide stein, and a flexible connection be tween said second stem and the air valve.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this twenty-ourtli day of June, A. D. one thousand nine hundred and twelve. Y

GEORGE M. SCHEBLER. A[1.. s.]

Witnesses:

FRANK A. FAHLE, G. B. SCHLEY. 

